本文介绍如何使用VS2005结合MapXtreme2005实现地图显示功能，包括页面及后台代码实现细节。
开发环境：vs2005 + MapXtreme2005
写下一点经验，供参考：
页面的代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
<img src="<%=m_strImg%>" alt="" style="width: 900px; height: 800px" id="MapControl1_Image" />
</td>
</tr>
<tr>
<td>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MapInfo.WebControls;
using System.IO;
using ApplicationStateManager;
public partial class Default2 : System.Web.UI.Page
{
protected string m_strImg = "";
protected void returnImage()
{
MapControlModel model = MapControlModel.GetModelFromSession();
if (model == null) model = MapControlModel.SetDefaultModelInSession();
MemoryStream ms = null;
try
{
ms = model.GetMap("Map1", 900, 800, "Gif");
}
catch (Exception ex)
{
HttpContext.Current.Server.ClearError();
return;
}
// Insert the image stream to Cache with key imageid and timeout in 2 mintues.
string imageid = ImageHelper.GetUniqueID();
ImageHelper.SetImageToCache(imageid, ms, 2);
m_strImg = ImageHelper.GetImageURL(imageid, "Gif");
}
private void Page_Load(object sender, System.EventArgs e)
{
// If the StateManager doesn't exist in the session put it else get it.
if (StateManager.GetStateManagerFromSession() == null)
StateManager.PutStateManagerInSession(new AppStateManager());
// Now Restore State
StateManager.GetStateManagerFromSession().ParamsDictionary[StateManager.ActiveMapAliasKey] = "Map1";
StateManager.GetStateManagerFromSession().RestoreState();
returnImage();
}
// At the time of unloading the page, save the state
private void Page_UnLoad(object sender, System.EventArgs e)
{
StateManager.GetStateManagerFromSession().SaveState();
}
}
配置文件：
<add key="MapInfo.Engine.Session.Workspace" value="C:/Program Files/MapInfo/MapXtreme/6.6/Samples/Data/World.mws" />
按照上述步骤就完成了地图的显示。
写下一点经验，供参考：
页面的代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>无标题页</title> </head><body> <form id="form1" runat="server"> <div> <table> <tr> <td> <img src="<%=m_strImg%>" alt="" style="width: 900px; height: 800px" id="MapControl1_Image" /> </td> </tr> <tr> <td> </td> </tr> </table> </div> </form></body></html>后台代码：
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using MapInfo.WebControls;using System.IO;using ApplicationStateManager;public partial class Default2 : System.Web.UI.Page{ protected string m_strImg = ""; protected void returnImage() {
MapControlModel model = MapControlModel.GetModelFromSession(); if (model == null) model = MapControlModel.SetDefaultModelInSession(); MemoryStream ms = null; try { ms = model.GetMap("Map1", 900, 800, "Gif"); } catch (Exception ex) { HttpContext.Current.Server.ClearError(); return; } // Insert the image stream to Cache with key imageid and timeout in 2 mintues. string imageid = ImageHelper.GetUniqueID(); ImageHelper.SetImageToCache(imageid, ms, 2); m_strImg = ImageHelper.GetImageURL(imageid, "Gif"); } private void Page_Load(object sender, System.EventArgs e) { // If the StateManager doesn't exist in the session put it else get it. if (StateManager.GetStateManagerFromSession() == null) StateManager.PutStateManagerInSession(new AppStateManager()); // Now Restore State StateManager.GetStateManagerFromSession().ParamsDictionary[StateManager.ActiveMapAliasKey] = "Map1"; StateManager.GetStateManagerFromSession().RestoreState(); returnImage(); } // At the time of unloading the page, save the state private void Page_UnLoad(object sender, System.EventArgs e) { StateManager.GetStateManagerFromSession().SaveState(); }}<add key="MapInfo.Engine.Session.Workspace" value="C:/Program Files/MapInfo/MapXtreme/6.6/Samples/Data/World.mws" />
按照上述步骤就完成了地图的显示。
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